diff --git a/README.rst b/README.rst
--- a/README.rst
+++ b/README.rst
@@ -28,7 +28,12 @@ At time of this writing, Django Conntrac
 following Django and Python versions:
 
 - *Python 2.7.x*
-- *Django 1.5.x*
+- *Django 1.11.x*
+
+In addition, *Django Conntrackt* uses the following external
+dependencies:
+
+- `Graphviz <https://graphviz.org/>`_
 
 
 Why was this application created?